s3-resource-simple/assets/check

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#!/bin/sh
# http://concourse.ci/implementing-resources.html#resource-check
set -e
# parse incoming config data
payload=`cat`
bucket=$(echo "$payload" | jq -r '.source.bucket')
prefix="$(echo "$payload" | jq -r '.source.path // ""')"
# export for `aws` cli
export AWS_ACCESS_KEY_ID=$(echo "$payload" | jq -r '.source.access_key_id')
export AWS_SECRET_ACCESS_KEY=$(echo "$payload" | jq -r '.source.secret_access_key')
# Consider the most recent LastModified timestamp as the most recent version.
timestamps=$(aws s3api list-objects --bucket $bucket --prefix "$prefix" --query 'Contents[].{LastModified: LastModified}')
recent="$(echo $timestamps | jq -r 'max_by(.LastModified)')"
echo "[$recent]"